Molybdenum disilicide and its composite materials are summarized 2025-01-04
Synthesis method and application of rare earth hexaboride 2024-12-21
In rare earth borides, boron shows many unique physical and chemical properties because of its lack of electronic properties. There are six kinds of rare earth borides, namely RB2, RB4, R2B5, RB6, RB12 and RB66, among which RB6 cathode material has the characteristics of high melting point, high hardness, low evaporation rate and good chemical stability of non-metallic insoluble compounds, and is a functional material with excellent emission performance. With the continuous development of ion beam and electron beam applications, people have put forward higher requirements on the performance of cathode materials, hoping to further improve the electron emission density, extend the service life and reduce the working temperature. Many researchers have been committed to the preparation process, structure, properties and physical and chemical properties of RB6 research, and achieved phased results. In this paper, the preparation methods of RB6 powder, single crystal and polycrystal are briefly introduced, and the method of preparing PrB6 and (LaxPr1-x) B6 by using SPS (discharge plasma sintering technology) is emphasized. The development of new RB6 cathode materials is explored and its application fields are studied.
Basic research and application prospect of a new superconductor magnesium diboride (MgB2) 2024-11-02
This paper introduces the discovery, research progress and application prospect of a new superconductor magnesium diboride.) Both theory and experiment have proved that the superconductivity of magnesium diboride comes from the coupling of electric phonons, which can be described by the BCS image with S-wave symmetry wave function.) However, in the superconductor of magnesium diboride, it is found that there are two superconducting bandgaps, one at 6meV. The other one is around 2meV, and they both open at the superconducting transition temperature, which brings something new to the study of superconductivity mechanisms.) In mixed state physics, it has been found that there is a large gap between the boundary between superconductivity and normal state (upper critical magnetic field He2) and the flux melting line (irreversible line Hirr), even at absolute zero. The author proposed that this may be due to the result of the double energy gap or the quantum melting of the magnetic flux matter) In terms of application, it is most likely to make it into a superconducting magnet, using a closed cycle refrigerator to refrigerate at about 20K, which is very likely to replace the liquid helium temperature superconducting magnet used in nuclear magnetic resonance imaging in medicine today).
MAX phase and MXene material 2024-10-19
MAX phase material is a natural layered carbon nitride inorganic non-metallic material composed of three elements, which has the electrical and thermal conductivity properties of metals, but also has the high strength, high temperature resistance, corrosion resistance and other harsh environment service ability of structural ceramics. MAX phase materials have gained extensive attention in the fields of high temperature lubrication, oxidation resistant coating, fault tolerant nuclear materials, self-healing composites and energy materials, and material scientists at home and abroad are actively carrying out a lot of exploration and research. China has made remarkable achievements in the field of MAX phase structural materials and MXene energy materials. With the development of synthesis technology and in-depth exploration of multi-disciplines, more and more domestic materials research groups have devoted themselves to the research of such novel materials.
Application of carbide ceramic materials in nuclear reactor field 2024-10-12
Mxenes material past life, present life and future 2024-09-21
Use of metal zirconium powder 2024-09-07
Metal zirconium powder is a metallic granular substance consisting of fine zirconium particles. After special treatment and processing, metal zirconium powder can be used in many different fields. This article will discuss the use of metal zirconium powder and its importance in various industries.
Layered ceramic material - Ti3SiC2 2024-08-24
In recent years, materials scientists have synthesized a new class of type 312 ceramic materials, whose general formula is M3XZ2, in which M is one or several transition metal elements (such as Ti, V, etc.), X is one or several main group elements, and many III and IV main group elements (such as Al, Ge, Si, etc.). Z is one or several non-metallic elements (such as C, N, B, etc.), 312-sex ternary compounds currently studied are mainly Ti3SiC2, Ti3AlC2, Ti3GeC2. They have the same crystal structure and belong to the P63/mmc space group. A typical example of this class of compounds is Ti3SiC2. This paper briefly introduces the Ti3SiC2 ceramic material.
Deep analysis of the role of titanium pentoxide in coating: revolutionizing optical coatings and enhancing electronic performance 2024-08-17
Application of niobium silicide 2024-07-31
Application of niobium silicide
The role of rare earth catalytic materials in automotive exhaust purification 2022-01-12
At present, the catalysts widely developed and applied in automobile exhaust purification abroad are basically composed of platinum (Pt), rhodium (Rh) and other precious metals. At present, the commonly used platinum rhodium-based precious metal ternary catalysts mainly purify HC and CO through the oxidation of Pt, and purify NOx through the reduction of Rh. Although the catalyst has the advantages of high activity, good purification effect and long life, but the cost is also high, especially the Pt, Rh and other resources are limited. In order to alleviate the contradiction between the supply and demand of Pt, especially Rh, palladium (Pd), which is relatively cheap, has been widely used, and catalysts composed of Pt, Rh and Pd as well as palladium catalysts have been developed
How important are metals for aerospace? 2024-07-06
